修改403逻辑: 先临时冷却，再根据连续次数决定是否判坏号

backend/internal/repository/openai_403_counter_cache.go

@@ -0,0 +1,51 @@
+package repository
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/Wei-Shaw/sub2api/internal/service"
+	"github.com/redis/go-redis/v9"
+)
+
+const openAI403CounterPrefix = "openai_403_count:account:"
+
+var openAI403CounterIncrScript = redis.NewScript(`
+	local key = KEYS[1]
+	local ttl = tonumber(ARGV[1])
+
+	local count = redis.call('INCR', key)
+	if count == 1 then
+		redis.call('EXPIRE', key, ttl)
+	end
+
+	return count
+`)
+
+type openAI403CounterCache struct {
+	rdb *redis.Client
+}
+
+func NewOpenAI403CounterCache(rdb *redis.Client) service.OpenAI403CounterCache {
+	return &openAI403CounterCache{rdb: rdb}
+}
+
+func (c *openAI403CounterCache) IncrementOpenAI403Count(ctx context.Context, accountID int64, windowMinutes int) (int64, error) {
+	key := fmt.Sprintf("%s%d", openAI403CounterPrefix, accountID)
+
+	ttlSeconds := windowMinutes * 60
+	if ttlSeconds < 60 {
+		ttlSeconds = 60
+	}
+
+	result, err := openAI403CounterIncrScript.Run(ctx, c.rdb, []string{key}, ttlSeconds).Int64()
+	if err != nil {
+		return 0, fmt.Errorf("increment openai 403 count: %w", err)
+	}
+	return result, nil
+}
+
+func (c *openAI403CounterCache) ResetOpenAI403Count(ctx context.Context, accountID int64) error {
+	key := fmt.Sprintf("%s%d", openAI403CounterPrefix, accountID)
+	return c.rdb.Del(ctx, key).Err()
+}